JP6706483B2 - Geared motor and method of manufacturing geared motor - Google Patents

Description

The present invention relates to a geared motor in which rotation of a motor pinion is transmitted to an output member via a transmission gear, and a method for manufacturing the geared motor.

As a technique for outputting a large torque from a motor, an output member having a spiral groove formed on an outer peripheral portion is provided between a first plate portion and a second plate portion of a frame, and a motor pinion fixed to a rotating shaft is output member. There is proposed a geared motor that transmits to a gear part of the above (see Patent Document 1). In such a geared motor, the output member is rotatably supported between the bearing attached to the first plate portion and the second plate portion. A large opening is provided in the first plate portion, and the output member is passed between the first plate portion and the second plate portion through the opening when manufacturing the geared motor.

JP, 2009-124867, A

However, in the geared motor described in Patent Document 1, since the bearing projects from the first plate portion toward the motor body, the size of the first plate portion is increased, and the position shifted from the motor body in the direction intersecting with the motor axis line. It is necessary to install a bearing in. Therefore, there is a problem that the geared motor becomes large. Further, in the geared motor described in Patent Document 1, since the rotation of the motor pinion fixed to the rotating shaft is directly transmitted to the gear portion of the output member, in order to obtain a large torque, the gear portion of the output member has a large diameter. Need to be converted. As a result, the gear part of the output member projects from the first plate part in a direction intersecting with the motor axis, which causes a problem of increasing the size of the geared motor.

In view of the above problems, an object of the present invention is to provide a geared motor and a method for manufacturing the geared motor that can obtain a large torque without increasing the size.

In order to solve the above problems, a geared motor according to the present invention includes a motor main body, a first plate portion fixed to one end of the motor main body in the motor axial direction, and one of the first plate portion to the first plate portion. Between a second plate part facing each other and a third plate part connecting the first plate part and the second plate part, and between the first plate part and the second plate part. A first fixed shaft arranged and a shaft hole through which the first fixed shaft passes are provided, and a gear portion and a spiral groove are sequentially provided on the outer peripheral portion from the other side in the motor axis direction toward the one side. An output member, a second fixed shaft having the other end of the shaft held by the first plate, and a motor rotatably supported by the second fixed shaft and fixed to the rotary shaft of the motor body. A transmission gear that decelerates the rotation of the pinion and transmits it to the gear portion, and is fixed to the frame so as to cover the gear portion and the transmission gear between the first plate portion and the second plate portion , A gear cover that supports a shaft end portion of the one side of a second fixed shaft, the first fixed shaft passing through a through hole formed in the second plate portion, and the first plate portion. The first shaft end of the first fixed shaft, which is inserted into the shaft hole of the output member arranged between the two plate parts and is on the other side of the first fixed shaft, is provided on the first plate part. The second shaft end portion and the second plate portion are fixed in a state where the second shaft end portion is fitted in the fixed shaft support hole and the one side second shaft end portion of the first fixed shaft is fitted in the through hole. The member includes the first fixed shaft between the first plate part and the second plate part in a state where the gear part and the transmission gear are covered by the gear cover and the spiral groove projects from the gear cover. It is characterized by being rotatably supported by .

The present invention also provides a motor body, a first plate portion fixed to one end of the motor body in the motor axis direction, a second plate portion facing the first plate portion on the one side, and A frame provided with a third plate part connecting the first plate part and the second plate part; a first fixed shaft arranged between the first plate part and the second plate part; An output member provided with a shaft hole through which the first fixed shaft penetrates, and an outer peripheral portion in which a gear part and a spiral groove are sequentially provided from the other side in the motor axis direction toward the one side, and the first plate part. The second fixed shaft holding the shaft end on the other side and the motor pinion rotatably supported by the second fixed shaft and fixed to the rotary shaft of the motor body to reduce the rotation of the motor pinion. And a transmission gear for transmitting to the first fixed shaft supporting hole in which the first shaft end portion of the other side of the first fixed shaft is fitted in the first plate portion. And a frame fixing step of fixing the frame to the motor body by providing a through hole into which the second shaft end portion of the one side of the first fixed shaft is fitted, in the second plate portion, Before or after the frame fixing step, a gear attaching step of attaching the transmission gear to the first plate portion via the second fixed shaft, and the first plate portion and the second plate portion from a direction intersecting a motor axis direction. An arranging step of arranging the output member between the plate portion and the first fixing shaft inserted into the shaft hole from the through hole to fit the first shaft end into the first fixing shaft support hole; It is characterized by including a fixed shaft inserting step and a first fixed shaft fixing step of fixing the second shaft end portion and the second plate portion.

In the present invention, the output member having the spiral groove on the outer peripheral portion is provided between the first plate portion and the second plate portion of the frame, and the rotation of the motor pinion fixed to the rotating shaft is transmitted via the transmission gear. The speed is reduced and transmitted to the output member. Therefore, a large torque can be output without increasing the diameter of the gear portion of the output member. A first fixed shaft is provided between the first plate portion and the second plate portion, and the output member is rotatably supported by the first fixed shaft. Therefore, since it is not necessary to provide a bearing on the first plate portion, it is not necessary to increase the size of the first plate portion. Therefore, the geared motor can be downsized. Further, the first plate portion is provided with a first fixed shaft support hole into which the first shaft end portion of the first fixed shaft is fitted, and the second plate portion is provided with a through hole into which the second shaft end portion of the first fixed shaft is fitted. It is provided. Therefore, after disposing the output member between the first plate portion and the second plate portion, the first fixed shaft is inserted from the through hole of the second plate portion into the shaft hole of the output member so that the first shaft end portion is formed. The second shaft end portion and the second plate portion can be fixed by fitting in the first fixed shaft support hole. Therefore, the output member can be rotatably supported between the first plate portion and the second plate portion without providing the first plate portion with a large opening through which the output member passes. Further, since the large opening does not have to be provided in the first plate portion, the second fixed shaft supporting the transmission gear can be provided at an appropriate position without increasing the size of the first plate portion. Therefore, the geared motor can be downsized.

In the present invention, it is preferable that the first fixed shaft is provided at a position overlapping the motor body in the motor axis direction. With this configuration, the first plate portion can be downsized, and thus the geared motor can be downsized.

In the geared motor according to the present invention, it is preferable that the first shaft end portion is in contact with a convex portion in the first fixed shaft support hole or a bottom portion of the first fixed shaft support hole. According to this structure, after the output member is arranged between the first plate portion and the second plate portion, the first fixed shaft is inserted from the through hole of the second plate portion into the shaft hole of the output member to form the first shaft. When the end portion is fitted in the first fixed shaft support hole, the first fixed shaft can be fixed in the motor axis direction.

In the geared motor according to the present invention, the gear cover includes an end plate portion that covers the motor pinion, the transmission gear, and the gear portion on the one side, and an outer peripheral portion of the gear portion on the opposite side of the transmission gear. It is preferable that the end plate portion is provided with an opening that allows a portion of the output member where the spiral groove is provided to project to the one side. That is, in the method for manufacturing a geared motor according to the present invention, in the disposing step, an end plate portion that covers the motor pinion, the transmission gear, and the gear portion on the one side, and an outer peripheral portion of the gear portion is the transmission gear. And a side plate portion that covers from the opposite side, and the end plate portion, the gear cover provided with an opening portion for protruding the portion of the output member where the spiral groove is provided to the one side, It is preferable that the gear cover is arranged between the first plate portion and the second plate portion together with the output member, and the gear cover is fixed to the frame. With this configuration, foreign matter is unlikely to adhere to the motor pinion, the transmission gear and the gear portion. Further, even when grease is applied between the motor pinion and the transmission gear or between the transmission gear and the gear portion, foreign matter is unlikely to adhere to the grease.

In the geared motor according to the present invention, it is preferable that the end plate portion is provided with a second fixed shaft support hole that supports the shaft end portion of the one side of the second fixed shaft. That is, in the geared motor according to the present invention, the end plate portion is provided with a second fixed shaft support hole for supporting the shaft end portion of the one side of the second fixed shaft, and in the disposing step, It is preferable that the shaft end portion of the one side of the second fixed shaft is fitted into and supported by the second fixed shaft support hole. With this configuration, the second fixed shaft can be reliably supported.

In the geared motor according to the present invention, it is preferable that a recess extending from the second fixed shaft support hole in a direction intersecting the motor axis is provided on the other surface of the end plate portion. .. That is, in the method for manufacturing a geared motor according to the present invention, a recess extending from the second fixed shaft support hole in a direction intersecting the motor axis is provided on the other surface of the end plate portion. In the arranging step, when the output member and the gear cover are arranged between the first plate portion and the second plate portion, the shaft end portion of the one side of the second fixed shaft is the recessed portion. It is preferable to fit the second fixed shaft support hole through the inside. According to this structure, even when the gear cover is arranged from the direction intersecting with the motor axis, the shaft end portion of the second fixed shaft on one side in the motor axis direction can be easily fitted into the second fixed shaft support hole. You can

The present invention is effective when applied to the case where the output member is made of resin. When the output member is made of resin, it is necessary to increase the outer diameter of the output member in order to secure the strength. However, according to the present invention, it is necessary to provide the first plate portion with a large opening through which the output member is passed. Absent.

In the geared motor according to the present invention, the gear cover is engaged with the frame when the gear cover is arranged between the first plate portion and the second plate portion in a direction intersecting the motor axis direction. It is preferable that the engaging portion is provided. That is, in the method for manufacturing a geared motor according to the present invention, the gear cover is engaged with the frame when the gear cover is arranged between the first plate portion and the second plate portion. A portion is provided, and in the disposing step, when the gear cover is disposed between the first plate portion and the second plate portion, the first plate portion and the engaging portion are engaged with each other. It is preferable that the gear cover is fixed to the frame. With this configuration, the gear cover can be fixed at a predetermined position on the frame.

In the geared motor according to the present invention, it is preferable that the second shaft end portion is fixed to the second plate portion by welding. With this configuration, the first fixed shaft can be reliably fixed to the frame.

In the present invention, the output member having the spiral groove on the outer peripheral portion is provided between the first plate portion and the second plate portion of the frame, and the rotation of the motor pinion fixed to the rotating shaft is transmitted via the transmission gear. The speed is reduced and transmitted to the output member. Therefore, a large torque can be output without increasing the diameter of the gear portion of the output member. A first fixed shaft is provided between the first plate portion and the second plate portion, and the output member is rotatably supported by the first fixed shaft. Therefore, since it is not necessary to provide a bearing on the first plate portion, it is not necessary to increase the size of the first plate portion. Therefore, the motor can be downsized. Further, the first plate portion is provided with a first fixed shaft support hole into which the first shaft end portion of the first fixed shaft is fitted, and the second plate portion is provided with a through hole into which the second shaft end portion of the first fixed shaft is fitted. It is provided. Therefore, after disposing the output member between the first plate portion and the second plate portion, the first fixed shaft is inserted from the through hole of the second plate portion into the shaft hole of the output member so that the first shaft end portion is formed. The second shaft end portion and the second plate portion can be fixed by fitting in the first fixed shaft support hole. Therefore, the output member can be rotatably supported between the first plate portion and the second plate portion without providing the first plate portion with a large opening through which the output member passes. Further, since it is not necessary to provide the large opening portion in the first plate portion, the second fixed shaft supporting the transmission gear can be provided in an appropriate position without increasing the size of the first plate portion. Therefore, the geared motor can be downsized.

It is explanatory drawing of the geared motor to which this invention is applied. It is sectional drawing of the geared motor to which this invention is applied. It is an exploded perspective view which looked at the inside of the geared motor to which the present invention was applied from the output side. It is explanatory drawing of the reduction gear mechanism etc. of the geared motor to which this invention is applied. It is the perspective view which looked at the gear cover of the geared motor to which the present invention was applied from the non-output side. It is explanatory drawing at the time of incorporating an output member and a gear cover in the manufacturing process of the geared motor to which this invention is applied.

An example of a geared motor to which the present invention is applied will be described with reference to the drawings. In the geared motor 1 described below, the rotation center axis of the rotation shaft 50 of the motor body 10 and the rotation center axis of the output member 8 are parallel to each other, and both can be regarded as the motor axis. In the following description, the rotation center axis of the output member 8 will be described as the motor axis L. Further, in the following description, in the direction in which the motor axis L extends (direction of the motor axis L), one side where the rotary shaft 50 projects from the stator 4 is the output side L1, and the rotary shaft 50 is the stator 4. The side opposite to the side projecting from the other side (the other side) will be described as the counter output side L2. In the frame 3, among the directions intersecting the motor axis L, a direction orthogonal to the third plate portion 33 is a first direction X, and a direction orthogonal to the first direction X and the motor axis L is a second direction Y. To do. Further, in the first direction X, the side where the first plate portion 31 and the second plate portion 32 project from the third plate portion 33 is defined as one side X1, and the side where the third plate portion 33 is located is the other side X2. And Further, in the drawings referred to below, the formation range of the spiral groove 83 is schematically shown by the alternate long and short dash line.

(overall structure)
FIG. 1 is an explanatory diagram of a geared motor 1 to which the present invention is applied. FIGS. 1A and 1B are perspective views of the geared motor 1 as viewed from an output side L1 and a geared motor 1 and a gear cover 7 respectively. It is the side view which looked at the removed state from the direction (2nd direction Y) orthogonal to motor axis L. FIG. 2 is a cross-sectional view of a geared motor 1 to which the present invention is applied, and FIGS. 2A, 2B, 2C, and 2D are cross-sectional views taken along the motor axis L of the geared motor 1. Drawing, sectional drawing which cut|disconnected the motor main body 10 along the rotation center axis line of the rotating shaft 50, sectional drawing when the 2nd board part 32 of the frame 3 was cut|disconnected at the position which passes through the through-hole 37, and the 1st of the frame 3 It is a sectional view when cutting plate part 31 in a position which passes along the 1st fixed shaft supporting hole 36. FIG. 3 is an exploded perspective view of the inside of the geared motor 1 to which the present invention is applied, as viewed from the output side L1, and FIGS. 3A and 3B are exploded views with the output member 8 removed from the geared motor 1. FIG. 3 is a perspective view and an exploded perspective view of the geared motor 1 with a gear cover 7 removed. 4A and 4B are explanatory views of the reduction gear mechanism 9 and the like of the geared motor 1 to which the present invention is applied, and FIGS. 4A and 4B are perspective views of the reduction gear mechanism 9 and the reduction gear mechanism 9 and the like. FIG.

As shown in FIGS. 1, 2, 3, and 4, the geared motor 1 is fixed to the motor body 10 and an end 11 of the motor body 10 on one side (output side L1) in the motor axis L direction. And a frame 3. The frame 3 includes a first plate portion 31 fixed to the end portion 11 on the output side L1 of the motor body 10 by welding or the like, and a second plate portion 32 facing the first plate portion 31 on the output side L1.
And a third plate part 33 that connects the first plate part 31 and the second plate part 32. Therefore, the first plate portion 31 and the second plate portion 32 have a structure bent from the third plate portion 33 toward the one side X1 in the first direction X. The first plate portion 31 has a substantially rectangular shape. A power supply unit 2 is provided on the side surface of the motor body 10.

A stepped hole 30 is formed in the first plate portion 31, and the rotary shaft 50 of the motor body 10 projects from the first plate portion 31 to the output side L1 through the hole 30. A motor pinion 55 is fixed to a portion of the rotating shaft 50 that projects from the first plate portion 31 to the output side L1.

The reduction gear mechanism 9 is provided between the first plate portion 31 and the second plate portion 32, and rotation of the motor pinion 55 (rotation of the rotating shaft 50) is output through the reduction gear mechanism 9 to an output member. 8 is transmitted. A gear cover 7 that covers the motor pinion 55 and the reduction gear mechanism 9 on the output side L1 is arranged between the first plate portion 31 and the second plate portion 32, and the gear cover 7 is fixed to the frame 3. There is.

(Fixed structure of the first fixed shaft 35)
A first fixed shaft 35 is provided between the first plate portion 31 and the second plate portion 32, and supports the output member 8 rotatably around the motor axis L. In the first fixed shaft 35, the first shaft end portion 351 on the opposite output side L2 is fitted into the first fixed shaft support hole 36 formed in the first plate portion 31 (see FIG. 2D). The second shaft end portion 352 of the output side L1 of the first fixed shaft 35 is fixed to the second plate portion 32 while being fitted into the through hole 37 formed in the second plate portion 32 (FIG. 2(c). )reference). For such fixing, a method such as welding, caulking or adhesion can be adopted. In this embodiment, the frame 3 is made of SUCC (low carbon stainless steel), and the first fixed shaft 35 is made of SUS (stainless steel). Therefore, the second shaft end portion 352 and the second plate portion 32 are fixed by welding. Therefore, the first fixed shaft 35 can be reliably fixed to the frame 3. In addition, welding has an advantage that burrs are less likely to occur than caulking and bonding. The frame 3 and the first fixed shaft 35 may be made of the same metal.

In the first plate portion 31, the first fixed shaft support hole 36 is a through hole. An annular protrusion 361 is left at the end (see FIG. 2D). The inner diameter of the convex portion 361 is smaller than the outer diameter of the first shaft end portion 351. Therefore, the first shaft end portion 351 contacts the convex portion 361 from the output side L1 inside the first fixed shaft support hole 36, and the position in the motor axis L direction is defined. The bottom of the first fixed shaft support hole 36 may be left, and in this case, the first shaft end 351 contacts the bottom of the first fixed shaft support hole 36, and the position in the motor axis L direction is defined. .. In the present embodiment, the first fixed shaft 35 is provided at a position overlapping the motor body 10 in the motor axis L direction.

(Structure of the output member 8)
The output member 8 is a shaft-shaped member in which a shaft hole 81 through which the first fixed shaft 35 penetrates is formed, and a gear portion 85 and a spiral groove 83 are formed on the outer peripheral portion from the non-output side L2 toward the output side L1. Formed in order. In this embodiment, the output member 8 is formed as a worm by the spiral groove 83. The output member 8 is provided with a shaft portion 861 in which teeth and the like are not formed between the gear portion 85 and the spiral groove 83, and teeth and the like are provided from the gear portion 85 toward the opposite output side L2 in the motor axis L direction. An unformed shaft portion 862 is provided.

In the output member 8, the outer diameter of the portion 84 where the spiral groove 83 is provided is the largest, and the outer diameter of the gear portion 85 and the shaft portion 861 is smaller than the outer diameter of the portion 84 where the spiral groove 83 is provided. The outer diameter of the shaft portion 862 is smaller than the outer diameters of the gear portion 85 and the shaft portion 861.

The output member 8 is made of resin, and the gear portion 85 and the spiral groove 83 are integrally formed.
Therefore, the output member 8 can be manufactured at low cost. Here, inside the output member 8, a cavity 82 is provided to prevent sink marks when the output member 8 is resin-molded. At the end portion on the output side L1 of the output member 8, the cylindrical portion 810 having the shaft hole 81 formed therein is used for a thrust bearing for reducing sliding resistance between the output member 8 and the second plate portion 32. A washer 89 is arranged.

(Structure of motor body 10)
As shown in FIG. 2B, the motor main body 10 is a stepping motor and has a cylindrical stator 4. The stator 4 has a structure in which the A-phase stator and the B-phase stator are arranged in an overlapping manner in the motor axis L direction. Therefore, in the stator 4, the two coil bobbins (the first coil bobbin 42A and the second coil bobbin 42B) around which the coil wire 46 is wound are arranged so as to overlap each other in the motor axis L direction. The stator cores to be described are arranged one above the other. An annular inner stator core 43A and an outer stator core 44A having a U-shaped cross section are superposed on both sides of the first coil bobbin 42A in the motor axis L direction, and an annular inner stator core 43A of the second coil bobbin 42B is provided on both sides in the motor axis L direction. The inner stator core 43B and the outer stator core 44B having a U-shaped cross section are arranged in an overlapping manner. On the inner peripheral surfaces of the first coil bobbin 42A and the second coil bobbin 42B, a plurality of pole teeth 45 of the inner stator cores 43A and 43B and the outer stator cores 44A and 44B are arranged side by side in the circumferential direction. In this way, the cylindrical stator 4 is configured, and the rotor 5 is coaxially arranged inside the stator 4 in the radial direction. In the present embodiment, the outer stator cores 44A and 44B respectively extend to the outside in the radial direction of the first coil bobbin 42A and the second coil bobbin 42B to form a motor case. Therefore, the end portion 11 of the motor body 10 on the output side L1 is formed by the annular portion 47 of the outer stator core 44A. The outer peripheral surface 13 of the motor body 10 is composed of a cylindrical portion 49 formed outside the outer stator cores 44A and 44B. An end plate 65 is fixed to the annular portion 48 of the outer stator core 44B, and the end 12 on the opposite output side L2 of the motor body 10 is composed of the end plate 65.

In the rotor 5, the rotary shaft 50 extends along the motor axis L, and the rotary shaft 50 projects from the end 11 of the motor body 10 on the output side L1. A cylindrical permanent magnet 59 is fixed by an adhesive or the like at a position near the opposite output side L2 of the rotating shaft 50. The outer peripheral surface of the permanent magnet 59 faces the pole teeth 45 of the stator 4 inside the stator 4 in the radial direction with a predetermined gap.

On the output side L1 of the motor body 10, the rotary shaft 50 is supported by a bearing 62 arranged in the hole 30 of the first plate portion 31 of the frame 3. A washer 66 through which the rotary shaft 50 penetrates is arranged between the bearing 62 and the permanent magnet 59. On the counter output side L2 of the motor body 10, the end plate 65 is formed with a hole 650 for allowing the end of the rotary shaft 50 on the counter output side L2 to project to the counter output side L2. A bearing 61 that supports the rotating shaft 50 on the counter output side L2 is arranged in the hole 650, and the bearing 61 projects from the end 12 of the counter output side L2 to the counter output side L2 in the motor body 10. The convex portion 17 is formed.

A washer 67 through which the rotary shaft 50 penetrates is disposed between the bearing 61 and the permanent magnet 59, and the rotor 5 is disposed on the output side L1 between the bottom of the recess 595 of the permanent magnet 59 and the washer 67. A biasing coil spring 63 is arranged around the rotating shaft 50. A washer 69 through which the rotary shaft 50 penetrates is disposed between the bottom of the recess 595 of the permanent magnet 59 and the coil spring 63.

(Structure of the reduction gear mechanism 9)
The reduction gear mechanism 9 has a plurality of transmission gears. In the present embodiment, the reduction gear mechanism 9 has three transmission gears (first transmission gear 91, second transmission gear 92, and third transmission gear 93). As shown in FIG. 4, the first transmission gear 91 is a compound gear, and is formed integrally with the large diameter gear 911 that meshes with the motor pinion 55 and the large diameter gear 911 coaxially on the output side L1 of the large diameter gear 911. The small diameter gear 912 and the cylindrical portion 915 that is integrally formed with the small diameter gear 912 coaxially on the output side L1 of the small diameter gear 912 are provided. The second transmission gear 92 is a compound gear, and is formed integrally with the large diameter gear 921 that meshes with the small diameter gear 912 of the first transmission gear 91 and the large diameter gear 921 coaxially on the output side L1 of the large diameter gear 921. And a small diameter gear 922. The third transmission gear 93 is a compound gear, and is formed integrally with the large diameter gear 931 that meshes with the small diameter gear 922 of the second transmission gear 92 and the large diameter gear 923 on the output side L1 of the large diameter gear 931. And a small diameter gear 932. The small diameter gear 932 meshes with the gear portion 85 of the output member 8.

The first transmission gear 91, the second transmission gear 92, and the third transmission gear 93 are rotatably supported by three second fixed shafts 96, 97, 98 supported by the first plate portion 31, respectively. .. More specifically, the second fixed shaft 96 is fitted in the shaft hole 910 of the first transmission gear 91, and the shaft end portion 961 of the second fixed shaft 96 on the opposite output side L2 is formed on the first plate portion 31. It is press-fitted and fixed in the hole 317. The second fixed shaft 97 is fitted in the shaft hole 920 of the second transmission gear 92, and the shaft end portion 971 of the second fixed shaft 97 on the opposite output side L2 is press-fitted and fixed in the hole 318 of the first plate portion 31. ing. The second fixed shaft 98 is fitted in the shaft hole 930 of the third transmission gear 93, and the shaft end portion 981 of the second fixed shaft 98 on the opposite output side L2 is press-fitted and fixed in the hole 319 of the first plate portion 31. ing. In the present embodiment, when viewed in the second direction Y, the second fixed shafts 96, 97, 98 are provided between the first fixed shaft support hole 36 that supports the first fixed shaft 35 and the third plate portion 33. The hole 30 is provided closer to the third plate portion 33 than the first fixed shaft support hole 36. Therefore, when viewed in the second direction Y, the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93 are provided between the gear portion 85 of the output member 8 and the third plate portion 33. The motor pinion 55 is provided closer to the third plate portion 33 than the gear portion 85 of the output member 8.

(Structure of gear cover 7)
FIG. 5 is a perspective view of the gear cover 7 of the geared motor 1 to which the present invention is applied, as viewed from the opposite output side L2.

As shown in FIGS. 1, 3 and 5, the gear cover 7 outputs the motor pinion 55, the first transmission gear 91, the second transmission gear 92, the third transmission gear 93, and the gear portion 85 of the output member 8. The end plate portion 71 covered with the side L1 and the outer peripheral portion of the gear portion 85 are covered with the side opposite to the third plate portion 33, the first transmission gear 91 and the second transmission gear 92 (one side X1 of the first direction X). And a side plate portion 72. The side plate portion 72 overlaps the first plate portion 31. In the present embodiment, the side plate portion 72 is located on the side of the third plate portion 33 (first direction X) from the side opposite to the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93 with respect to the gear portion 85. On the other side X2), the side where the third plate portion 33 is located is the release end 720.

The end plate portion 71 is formed with an opening 710 that allows the portion 84 of the output member 8 where the spiral groove 83 is provided to project toward the first plate portion 31 side (output side L1). Further, in the end plate portion 71, the second fixed shaft support holes 77 for fitting and supporting the shaft end portions 962, 972, 982 on one side (output side L1) of the second fixed shafts 96, 97, 98, respectively. 78 and 79 are formed. Therefore, both ends of the second fixed shafts 96, 97, 98 are supported by the first plate portion 31 of the frame 3 and the end plate portion 71 of the gear cover 7. Therefore, the second fixed shafts 96, 97, 98 can be maintained in a stable posture.

Recesses 770, 780 extending from the second fixed shaft support holes 77, 78, 79 to the other side X2 in the first direction X (on the release end 720 side) are formed on the surface of the end plate portion 71 opposite to the output side L2. 790 is formed. In the present embodiment, the recess 780 is formed around the second fixed shaft support hole 77 in the first transmission gear 9.
It is formed in a size overlapping the first cylindrical portion 915, and extends from around the second fixed shaft support hole 77 to the release end 720 side (the other side X2 in the first direction X). The recess 780 is formed to have a size that overlaps the small diameter gear 922 of the second transmission gear 92 around the second fixed shaft support hole 78, and extends from the periphery of the second fixed shaft support hole 78 toward the release end 720 (first direction). It extends to the other side X2) of X. The recessed portion 790 is formed to have a size that overlaps the small diameter gear 932 of the third transmission gear 93 around the second fixed shaft support hole 79, and extends from around the second fixed shaft support hole 79 to the release end 720 side (first direction). It extends to the other side X2) of X.

The gear cover 7 configured as described above is provided with an engaging portion that engages with the frame 3. First, the third plate portion 33 is formed with an engagement protrusion 335 protruding toward the one side X1 in the first direction X, and the end portion of the end plate portion 71 of the gear cover 7 on the release end 720 side is formed. An engagement hole 750 (engagement portion) is formed. Therefore, the open end 720 is directed toward the third plate portion 33, and the gear cover 7 is moved between the first plate portion 31 and the second plate portion 32 from the one side X1 in the first direction X toward the other side X2. When inserted, the engaging protrusion 335 fits into the engaging hole 750 and engages.

An engaging hole 314 is formed near the end of the first plate portion 31 on the one side X1 in the first direction X, and an engaging protrusion 74 (engaging portion) is formed on the end of the side plate portion 72 on the opposite output side L2. ) Has been formed. Therefore, the open end 720 is directed toward the third plate portion 33, and the gear cover 7 is moved between the first plate portion 31 and the second plate portion 32 from the one side X1 in the first direction X toward the other side X2. After the insertion, when the gear cover 7 is pressed to the opposite output side L2, the engagement protrusion 74 fits into the engagement hole 314.

Therefore, the open end 720 is directed toward the third plate portion 33 side, and the gear cover 7 is directed between the first plate portion 31 and the second plate portion 32 from the one side X1 in the first direction X to the other side X2. The gear cover 7 can be fixed to the frame 3 by inserting it.

A hole 313 is formed in the first plate portion 31 at a position adjacent to the engaging hole 314. The hole 313 is a hole for positioning when fixing the frame 3 to the motor body 10.

(Production method)
FIG. 6 is an explanatory diagram when the output member 8 and the gear cover 7 are assembled in the manufacturing process of the geared motor 1 to which the present invention is applied. In the manufacturing process of the geared motor 1 of the present embodiment, as shown in FIG. 6, the frame 3 is fixed to the motor body 10 in the frame fixing process, and in the gear mounting process, the first frame is formed before or after the frame fixing process. The transmission gear 91, the second transmission gear 92, and the third transmission gear 93 are attached to the first plate portion 31 via the second fixed shafts 96, 97, 98.

Next, in the arranging step, the output member 8 is inserted between the first plate portion 31 and the second plate portion 32 from one side X1 of the first direction X intersecting the direction of the motor axis L. At that time, the output member 8 is passed through the opening 710 of the gear cover 7 and is directed between the first plate part 31 and the second plate part 32 in the first direction X intersecting the motor axis L direction. The output member 8 and the gear cover 7 are inserted together from the one side X1. At that time, after the gear cover 7 is inserted between the first plate portion 31 and the second plate portion 32 with the open end 720 facing the third plate portion 33 side, the gear cover 7 is pressed to the opposite output side L2. To do. As a result, the engagement protrusion 335 of the frame 3 fits into and engages with the engagement groove 750 of the gear cover 7. Further, the engagement protrusion 74 engages with the first plate portion 31. Therefore, since the gear cover 7 is fixed to the frame 3, the gear cover 7 can be easily fixed. Further, the shaft end portions 962, 972, 982 of the second fixed shafts 96, 97, 98 automatically pass through the recesses 770, 780, 790 of the gear cover 7 and are automatically inserted into the second fixed shaft support holes 77, 78, 79. Since it fits, the gear cover 7 can be easily attached.

Next, in the step of inserting the first fixed shaft, the through hole 37 of the second plate portion 32 through the shaft hole 81 of the output member 8 is inserted.
The first fixed shaft 35 is inserted into and the first shaft end portion 351 is fitted into the first fixed shaft support hole 36 of the first plate portion 31. At that time, the first shaft end portion 351 contacts the convex portion 361 in the first fixed shaft support hole 36 and is positioned in the direction of the motor axis L. Therefore, the end portion of the first shaft end portion 351 does not project from the first plate portion 31 to the counter output side L2. Therefore, even if the first fixed shaft 35 is provided at a position overlapping the motor body 10 in the motor axis L direction, the first fixed shaft 35 and the motor body 10 do not interfere with each other.

Next, in the first fixed shaft fixing step, the second shaft end portion 352 and the second plate portion 32 are fixed by welding. As a result, the geared motor 1 is completed.

(Main effects of this embodiment)
As described above, in the geared motor 1 of the present embodiment, the output member 8 having the spiral groove 83 formed on the outer peripheral portion is provided between the first plate portion 31 and the second plate portion 32 of the frame 3, and the rotation shaft The rotation of the motor pinion 55 fixed to 50 is decelerated and transmitted to the output member 8 via the transmission gears (the first transmission gear 91 and the second transmission gear 92) of the reduction gear mechanism 9. Therefore, a large torque can be output from the output member 8 without increasing the diameter of the gear portion 85 of the output member 8.

A first fixed shaft 35 is provided between the first plate portion 31 and the second plate portion 32, and the output member 8 is rotatably supported by the first fixed shaft 35. Therefore, since the positional accuracy of the output member 8 is high, the positional accuracy of meshing in the spiral groove 83 and the gear portion 85 is high. Therefore, it is possible to maintain high torque transmission efficiency in a wide operating temperature range and output high torque. Moreover, since it is not necessary to provide a bearing on the first plate portion 31, it is not necessary to increase the size of the first plate portion 31. Further, since it is not necessary to provide a bearing on the first plate portion 31, the first fixed shaft 35 should be provided at a position overlapping the motor body 10 in the motor axis L direction without increasing the size of the first plate portion 31. You can Therefore, the geared motor 1 can be downsized.

Further, the first plate portion 31 is provided with a first fixed shaft support hole 36 into which the first shaft end portion 351 of the first fixed shaft 35 is fitted, and the second plate portion 32 is provided with the second shaft end portion of the first fixed shaft 35. A through hole 37 into which 352 is fitted is provided. Therefore, after the output member 8 is arranged between the first plate portion 31 and the second plate portion 32, the first fixed shaft 35 is inserted from the through hole 37 of the second plate portion 32 into the shaft hole 81 of the output member 8. It is possible to insert the first shaft end portion 351 into the first fixed shaft support hole 36 and then fix the second shaft end portion 352 and the second plate portion 32. Therefore, the output member 8 can be rotatably supported between the first plate portion 31 and the second plate portion 32 without providing the first plate portion 31 with a large opening through which the output member 8 is passed. Particularly in the present embodiment, since the output member 8 is made of resin, the outer diameter of the output member 8 needs to be increased in order to secure the strength, but a large opening through which the output member 8 is inserted is formed in the first plate portion 31. It need not be provided. Therefore, it is not necessary to increase the size of the first plate portion 31. Therefore, the geared motor 1 can be downsized.

Further, since it is not necessary to provide a large opening portion in the first plate portion 31, the transmission gears (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 91 may be formed without increasing the size of the first plate portion 31. The second fixed shafts 96, 97, 98 supporting 93) can be provided at appropriate positions. Therefore, the geared motor 1 can be downsized. Further, since it is not necessary to provide the large opening portion in the first plate portion 31, it is not necessary to largely separate the rotation center axis line of the second transmission gear 92 and the rotation center axis line L of the output member 8. Therefore, a sufficient reduction gear ratio can be obtained without increasing the outer diameter of the final gear (third transmission gear 93) and the outer diameter of the gear portion 85 of the output member 8. Therefore, the geared motor 1 can be downsized.

Further, in the first plate portion 31, the coordinate positions of the output member 8 and the transmission gears (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93) can be set, so the reduction gear mechanism 9 The position accuracy of meshing is high. Therefore, high torque transmission efficiency can be maintained and high torque can be output in a wide operating temperature range.

The motor pinion 55, the transmission gears (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93) and the gear portion 85 of the output member 8 are covered with the gear cover 7. Therefore, foreign matter is unlikely to adhere to the motor pinion 55, the transmission gears (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93) and the gear portion 85 of the output member 8. Also, grease is applied between the motor pinion and the transmission gear, the motor pinion 55, the transmission gear (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93) and the gear portion 85 of the output member 8. Even if it does, foreign matter does not easily adhere to the grease.

Further, in this embodiment, the rotation of the motor pinion 55 is decelerated and transmitted to the output member 8 via the transmission gears (the first transmission gear 91, the second transmission gear 92, and the third transmission gear 93) of the reduction gear mechanism 9. Therefore, even if the gear portion 85 of the output member 8 is smaller than the outer diameter of the portion 84 where the spiral groove 83 is provided, a large torque can be output. Therefore, it is possible to prevent the geared motor 1 from increasing in size due to the influence of the gear portion 85 of the output member 8. Even when the gear cover 7 is provided, the side plate portion 72 of the gear cover 7 that covers the outer peripheral portion of the gear portion 85 of the output member 8 is located at a position close to the rotation center axis of the output member 8. Therefore, the gear cover 7 can prevent the geared motor 1 from increasing in size. In particular, in this embodiment, the side plate portion 72 overlaps the first plate portion 31 in the motor axis L direction, so that the side plate portion 72 of the gear cover 7 can prevent the geared motor from increasing in size.

1... Geared motor, 3... Frame, 8... Output member, 9... Reduction gear mechanism, 4... Stator, 5... Rotor, 7... Gear cover, 10... Motor body, 31... 1 plate part, 32... second plate part, 33... third plate part, 35... first fixed shaft, 36... first fixed shaft support hole, 37... through hole, 50... rotary shaft, 55 ··· Motor pinion, 71 · · End plate portion, 72 · · Side plate portion, 73 · · Flange portion, 74 · · Engagement convex portion (engagement portion), 77, 78, 79 · · Second fixed shaft support Hole, 81... Shaft hole, 83.. Spiral groove, 84.. Spiral groove provided portion, 85.. Gear portion, 91.. First transmission gear, 92.. Second transmission gear, 93.・Third transmission gears, 96, 97, 98・・Second fixed shaft, 351・・First shaft end portion, 352・・Second shaft end portion, 361・・Convex portion, 710・・Opening portion, 750・· Engagement holes (engagement portions), 770, 780, 790 · · Recesses, 961, 971, 981 · · Shaft end portion on the other side, 962, 972, 982 · · Shaft end portion on one side, L · · Motor axis direction, L1... Output side (one side in motor axis direction), L2... Counter output side (other side in motor axis direction)

Claims (14)

The motor body,
A first plate part fixed to one end of the motor body in the motor axis direction, a second plate part facing the first plate part on the one side, and the first plate part and the second plate. A frame provided with a third plate part for connecting the parts,
A first fixed shaft arranged between the first plate portion and the second plate portion;
An output member provided with a shaft hole through which the first fixed shaft penetrates, and a gear portion and a spiral groove provided in order on the outer peripheral portion from the other side in the motor axis direction toward the one side,
A second fixed shaft in which the shaft end portion on the other side is held by the first plate portion;
A transmission gear that is rotatably supported by the second fixed shaft and that reduces the rotation of a motor pinion fixed to the rotation shaft of the motor body and transmits the rotation to the gear unit;
A gear cover that is fixed to the frame so as to cover the gear portion and the transmission gear between the first plate portion and the second plate portion and supports the shaft end portion of the one side of the second fixed shaft. When,
Have
The first fixed shaft is inserted into the shaft hole of the output member arranged between the first plate part and the second plate part through a through hole formed in the second plate part,
The first shaft end portion on the other side of the first fixed shaft fits into a first fixed shaft support hole provided on the first plate portion, and the second shaft end portion on the one side of the first fixed shaft. The second shaft end portion and the second plate portion are fixed in a state where is fitted into the through hole,
In the output member, the gear portion and the transmission gear are covered with the gear cover, and the spiral groove projects from the gear cover, and the first member is provided between the first plate portion and the second plate portion. A geared motor, which is rotatably supported by a fixed shaft . The geared motor according to claim 1, wherein the first fixed shaft is provided at a position overlapping the motor body in the motor axis direction. 3. The geared motor according to claim 1, wherein the first shaft end portion is in contact with a convex portion in the first fixed shaft support hole or a bottom portion of the first fixed shaft support hole. The gear cover includes the motor pinion, an end plate portion that covers the transmission gear and the gear portion on the one side, and a side plate portion that covers an outer peripheral portion of the gear portion on the opposite side to the transmission gear,
4. The end plate portion is provided with an opening portion that allows a portion of the output member where the spiral groove is provided to project to the one side. Geared motor described. The geared motor according to claim 4, wherein the end plate portion is provided with a second fixed shaft support hole that supports the shaft end portion of the one side of the second fixed shaft. The concave portion extending from the second fixed shaft support hole in a direction intersecting the motor axis line is provided on the other surface of the end plate portion. Geared motor. The gear cover is provided with an engaging portion that engages with the frame when the gear cover is arranged between the first plate portion and the second plate portion in a direction intersecting the motor axis direction. The geared motor according to any one of claims 4 to 6, characterized in that: The geared motor according to any one of claims 1 to 7, wherein the output member is made of resin. 9. The geared motor according to claim 1, wherein the second shaft end portion is fixed to the second plate portion by welding. The motor body,
A first plate part fixed to one end of the motor body in the motor axis direction, a second plate part facing the first plate part on the one side, and the first plate part and the second plate. Third connecting parts
A frame with a plate,
A first fixed shaft arranged between the first plate portion and the second plate portion;
An output member provided with a shaft hole through which the first fixed shaft passes, and a gear portion and a spiral groove are sequentially provided on the outer peripheral portion from the other side in the motor axis direction toward the one side,
A second fixed shaft in which the shaft end portion on the other side is held by the first plate portion;
A transmission gear that is rotatably supported by the second fixed shaft and that reduces the rotation of a motor pinion fixed to the rotation shaft of the motor body and transmits the rotation to the gear unit.
A method for manufacturing a geared motor having:
The first plate portion is provided with a first fixed shaft support hole into which the first shaft end portion of the other side of the first fixed shaft is fitted, and the second plate portion is provided with the first fixed shaft support hole. A through hole into which the second shaft end on one side is fitted is provided,
A frame fixing step of fixing the frame to the motor body,
A gear mounting step of mounting the transmission gear on the first plate portion via the second fixed shaft before or after the frame fixing step;
An arranging step of arranging the output member between the first plate portion and the second plate portion from a direction intersecting the motor axis direction;
A first fixed shaft inserting step of inserting the first fixed shaft into the shaft hole from the through hole and fitting the first shaft end portion into the first fixed shaft support hole;
A first fixed shaft fixing step of fixing the second shaft end portion and the second plate portion, and a method for manufacturing a geared motor, comprising: In the disposing step, the motor pinion, an end plate portion that covers the transmission gear and the gear portion on the one side, and a side plate portion that covers an outer peripheral portion of the gear portion from the opposite side to the transmission gear, In the end plate portion, a gear cover having an opening for allowing a portion of the output member where the spiral groove is provided to project to the one side is provided, together with the output member, the first plate portion and the first plate portion. Placed between the two plates,
The method of manufacturing a geared motor according to claim 10, wherein the gear cover is fixed to the frame. The end plate portion is provided with a second fixed shaft support hole for supporting the shaft end portion of the one side of the second fixed shaft,
The method of manufacturing a geared motor according to claim 11, wherein, in the disposing step, a shaft end portion of the one side of the second fixed shaft is fitted into and supported by the second fixed shaft support hole. A recess extending from the second fixed shaft support hole in a direction intersecting the motor axis is provided on the other surface of the end plate portion.
In the arranging step, when the output member and the gear cover are arranged between the first plate portion and the second plate portion, the shaft end portion of the second fixed shaft on the one side is in the recess. 13. The method for manufacturing a geared motor according to claim 12, wherein the second fixed shaft support hole is fitted therethrough. The gear cover is provided with an engaging portion that engages with the frame when the gear cover is arranged between the first plate portion and the second plate portion,
In the arrangement step, when the gear cover is arranged between the first plate portion and the second plate portion, the first plate portion and the engaging portion are engaged with each other, and the gear cover is 14. The method of manufacturing a geared motor according to claim 11, wherein the method is fixed to a frame.

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